A mother bought three dress for her triplets daughters(one for each) and put the dresses in the dark. One by one the girls come and pick a dress.
What is the probability that no girl will choose her own dress?

How will you measure 15 minutes using two hourglasses of 7 minutes and 11 minutes respectively?

If you drop me I’m sure to crack, but give me a smile and I’ll always smile back. What am I?

A chess tournament is taking place on knock-out terms (the one who loses the match is out of the game).
(a) If 10 matches are played in total, how many players participated?
(b) If 20 players took part in the tournament, how many matches were played?

I always drive my customer away.

Who am I?

How can you make the following equation true by drawing only one straight line: 5+5+5=550 ?

Decode below three cipher riddles:

26 L of the A
7 D of the W
1000 Y in a M

A mile-long train is moving at sixty miles an hour when it reaches a mile-long tunnel. How long does it take the entire train to pass through the tunnel?

A boy purchased a book from a bookkeeper and gave him $100.
The cost of the book is $50 but the bookkeeper has no change, so he gets the change from the next shop and returns the boy his $50.

After some time the next shopkeeper came with the $100 note and told the bookkeeper that the note was a fraud, so he took the money back.

How much loss did the bookkeeper face?

Replace the question mark with the correct number.